If you are getting mismatch from one pass to another your spindle is not perpendicular to the plane of motion you have the workpiece clamped to. The only other thing I can think of is if are cutting with the Y axis and indexing the X axis for the passes across the workpiece. If the table extends far past the Y axis ways you will have table droop because of weight transfer. You cannot avoid it unless you have outriggers to support the table. Heh, on a knee mill if you use the X axis to cut and index the Y axis you will end up with a convex surface you just faced.
hth Stuart On Thu, May 21, 2020, 11:42 AM John Dammeyer <jo...@autoartisans.com> wrote: > This was a year ago but based on the latest fly cutting results I'm > getting slight ridges so either the fly cutter isn't exactly turning a > perfect horizontal arc or I need to tram again. > http://www.autoartisans.com/mill/TrammedVertical.jpg > > Or it's something to do with the backlash. > > John > > > > -----Original Message----- > > From: Jon Elson [mailto:el...@pico-systems.com] > > Sent: May-21-20 9:25 AM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Face Milling > > > > On 05/20/2020 11:56 PM, John Dammeyer wrote: > > > > > > Anyone used one of these? > > > https://www.aliexpress.com/item/4000890081459.html > > > > > > > > Years ago, we had CNC meetings at Roland Friestad's shop > > near Galesburg, IL. He made CNC retrofits to sell to tech > > schools, and apparently made some of his own tooling. I > > found a bunch of very similar > > small face mills with R-8 taper, and I think we bought all > > he had. I'm still using them for this type > > of face milling work. The bigger the face mill, the more > > accurately you need to have your machine trammed. > > > > Jon > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
